Registration Dossier

Diss Factsheets

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.122 mg/L
Assessment factor:
1 000
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
1.219 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.012 mg/L
Assessment factor:
10 000
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
10.121 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
100.197 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
100.197 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
23.491 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

Classification is not triggered based on available data, according to REGULATION (EC) No 1272/2008 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006.

Conclusion on classification

Classification of difluoroacetic acid for effects in the environment

In determining the classification appropriate to difluoroacetic acid, it is necessary to consider all available evidence concerning its persistence, potential to accumulate and predicted or observed environmental fate and behaviour that may present a long-term and/or delayed danger to the structure and/or functioning of aquatic ecosystems. These points are considered below. 

 

Persistence

 

Reliable studies are available to demonstrate that difluoroacetic acid is non persistent in the water environment. Moreover, its persistent characteristics are only observe in the sediment and soil compartment but exposure to the soil and sediment is generally unlikely and hence it has been concluded that difluoroacetic acid is non persistent in nature.  

 

Thus, difluoroacetic acid is classified as a non persistent (P) chemical. 

 

Potential to accumulate

The estimated log Kow values for difluoroacetic acid is less than 4 (Log Kow = 0.600). The potential for difluoroacetic acid to bioaccumulate in the tissues of organisms that inhabit aquatic or terrestrial matrices is negligible as the BCF factor for the substance is less than 1000.  

 

The estimated BCF of difluoroacetic acid is highest 3.2 dimensionless and below the threshold of 2000. 

 

Thus, difluoroacetic acid does not satisfy the criterion for classification as bioaccumulative (B).

 

The toxicity values of fish, invertebrates and algae are LC50 = 121.88 mg/L, LC50 = 236 mg/L and EC50 = 4141.5 mg/L, respectively. These values suggest classification for aquatic toxicity will not be applicable for all of the tropic levels and the same is based on the above mentioned estimation studies.

 

So,difluoroacetic acid does not satisfy the environmental effects criterion for classification as toxic (T).

 

Thus it can be inferred that difluoroacetic acid is a non PBT (including vPvB) substance.